Unknown Cenex lawn tractor

I found an old riding lawn mower in the garage of my wife's family cabin and need to know what brand/model it is. on the side it says "Cenex" towards the front, "Special Edition" in the middle and "12/36 Extra Life" and "51 x 493" down low below "Special Edition". the unit is grey and red. I want to be able to see if the mower is functional/repairable as the cabin sits on 22+ acres and 3+ is open field to be kept up and a push mower is not an efficient method.

Final photo i was able to get of mower. this is a close up of the "12/36" logo

Sorry I am not able to get better photos or find model/serial stamps but the mower is currently completely covered with junk and i only had a few minutes after discovering it to get photos before leaving the cabin at the end of the weekend. Hopefully I will be heading back up to the cabin in 2 weeks to spend some quality time not prepping for the season.

The cenex tractors were built by mtd,probably from the early 90's,next time you look at tractor clean off same & look on bottom of seat/on fender pan under seat,mtd usually put id tag at these locations.

If you locate tag,write down mod/sn of tractor,if your intrested in parts goto www.partstree.com & look up mod# in mtd lawn tractor listings,if you need/want an operators manual do a goggle search for mtd manuals,click on link to mtd manuals-pdf manual web archive,enter mod/sn,see if operators manual avail as a free download.If manual not avail,search ebay for mtd manuals & in listings see if manual listed for your tractor.